A rare puzzle. Introduced to the puzzle community by the late Edward Hordern at IPP 1992 as an exchange gift.A clockwise twist of the front face changes the 3 colours at the marked windows (at 12, 3, 7 o'clock). Anti-clockwise twists change nothing, except reposition the marked windows for the next move. Diameter: 72mmHeight: 17mmWeight: 35g

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